Does Palo Alto support decryption with Wildcard SSL-cert?
In order to determine if a connection needs to be decrypted or not, the firewall relies on the (CN) common name configured within the certificate and compares that to the security policy. ( https://live.paloaltonetworks.com/t5/Management-Articles/SSL-Decryption-Rules-Not-Matching-FQDN/ta-p... )
The firewall does not only rely on the CM in order to decide if the connection needs to be decrypted. In most connections (everything from a browser that is not older than about 4 years) the TLS handshake client hello packet contains the Server Name Indicator extension. In this field the client specifies the required FQDN and this is also checked by the firewall. So even the server has a wildcard cert the exclusion can normally still be configured with the FQDN - if the client sends a handshake packet WITH this extension.
ok maybe i dont get it. you talking about outbound decryption, but between two internal zones?
can you tell me where is the wildcard certificate installed? on the server you which to connect to, right?
if so, this normally could be possible to decrypt if:
- you have an ca certifiacte installed and checked it under certificates as your trusted forward certificate (as vsys_remo mentioned)
- you have an adequate decprytion rule for your "outbound" connection, where "outbound" means from one zone to the other
- the server is using a protocol (no proprietary encryption) and cipher suite which is supported by your PANOS Version
And you are sure, that your server didn't use any unsupported ciphers??
And check it on your servers or the best way is to take a packet capture and analyse the ssl handshake to see if there are any unsupported ciphers in use.
For a quick check use the global counters. Here is an article that maybe help:
"Problem is - we can't make it work...."
If you can supply any more details than that, it would be very helpful.
What isn't working?
Can you not assign the certificate to the decryption rule?
Did you import the private key when you imported your wildcard?
Does everything appear correctly but the traffic just isn't decrypted?
What PAN-OS version are you using?
Some more details will help people trying to assist. The answers to the questions above can help narrow down where to help you troubleshoot.
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